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/* Cygwin host-specific hook definitions.
Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
GCC is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include <sys/mman.h>
#include "hosthooks.h"
#include "hosthooks-def.h"
#include "toplev.h"
#include "diagnostic.h"
static void * cygwin_gt_pch_get_address (size_t, int fd);
static size_t cygwin_gt_pch_alloc_granularity (void);
#undef HOST_HOOKS_GT_PCH_GET_ADDRESS
#define HOST_HOOKS_GT_PCH_GET_ADDRESS cygwin_gt_pch_get_address
#undef HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY
#define HOST_HOOKS_GT_PCH_ALLOC_GRANULARITY cygwin_gt_pch_alloc_granularity
/* Granularity for reserving address space. */
static const size_t va_granularity = 0x10000;
/* Return the alignment required for allocating virtual memory. */
static size_t
cygwin_gt_pch_alloc_granularity (void)
{
return va_granularity;
}
/* Identify an address that's likely to be free in a subsequent invocation
of the compiler. The area should be able to hold SIZE bytes. FD is an
open file descriptor if the host would like to probe with mmap. */
static void *
cygwin_gt_pch_get_address (size_t sz, int fd)
{
void *base;
off_t p = lseek(fd, 0, SEEK_CUR);
if (p == (off_t) -1)
fatal_error ("can't get position in PCH file: %m");
/* Cygwin requires that the underlying file be at least
as large as the requested mapping. */
if ((size_t) p < sz)
{
if ( ftruncate (fd, sz) == -1 )
fatal_error ("can't extend PCH file: %m");
}
base = mmap (NULL, sz, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
if (base == MAP_FAILED)
base = NULL;
else
munmap (base, sz);
if (lseek (fd, p, SEEK_SET) == (off_t) -1 )
fatal_error ("can't set position in PCH file: %m");
return base;
}
const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
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